Manchester United manager Jose Mourinho has hit out at Frank de Boer, calling him the "worst manager in Premier League history".

Mourinho is not wrong in his assessment statistically, with de Boer in charge for the shortest amount of time - four games - and his Eagles side failing to score a goal or earn a single point under his stewardship.

De Boer was a guest on BT Sport's coverage of the Chelsea versus Crystal Palace game at the weekend and then on the TV channel's Premier League Tonight show immediately afterwards.

On it, the Dutch legend said that it was "a pity" England international Marcus Rashford played under Mourinho at Old Trafford, insisting that he should play every week.

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Palace at Chelsea

De Boer said: "It's a pity that the manager is Mourinho because normally he's an English player you want to give him time and he can then make mistakes. But Mourinho is not like that. He wants to get results."

(Photo by Matthew Peters/Man Utd via Getty Images)

Before the win over Liverpool during which Rashford netted both goals in a 2-1 win, the 20-year-old had not started a Premier League game since Boxing Day.

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And Mourinho hit back during his pre-Sevilla press conference today, saying that if de Boer had been managing Rashford, the youngster would "learn how to lose".

Mourinho said: "I read a quote from the worst manager in the history of the Premier League, Frank De Boer - seven matches, seven losses - that Marcus would not learn under me. If Marcus would be coached by Frank, he would learn how to lose."